scholarly journals Synergistic Effect of Nanophotocatalysis and Nonthermal Plasma on the Removal of Indoor HCHO

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Yuanwei Lu ◽  
Dinghui Wang ◽  
Yuting Wu ◽  
Chongfang Ma ◽  
Xingjuan Zhang ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Indoor Air ◽  
Photocatalytic Oxidation ◽  
Reaction Rate ◽  
Nonthermal Plasma ◽  
Pollutant Removal ◽  
Pollutant Concentration ◽  
Air Purification ◽  
Plate Electrode ◽  
Air Treatment

Photocatalysis is an effective method of air purification at the condition of a higher pollutant concentration. However, its wide application in indoor air cleaning is limited due to the low level of indoor air contaminants. Immobilizing the nanosized TiO2particles on the surface of activated carbon filter (TiO2/AC film) could increase the photocatalytic reaction rate as a local high pollutant concentration can be formed on the surface of TiO2by the adsorption of AC. However, the pollutant removal still decreased quickly with the increase in flow velocity, which results in a decrease in air treatment capacity. In order to improve the air treatment capacity by the photocatalytic oxidation (PCO) method, this paper used formaldehyde (HCHO) as a contaminant to study the effect of combination of PCO with nonthermal plasma technology (NTP) on the removal of HCHO. The experimental results show that HCHO removal is more effective with line-to-plate electrode discharge reactor; the HCHO removal and the reaction rate can be enhanced and the amount of air that needs to be cleaned can be improved. Meanwhile, the results show that there is the synergistic effect on the indoor air purification by the combination of PCO with NTP.

scholarly journals Heterogeneous Photocatalysis Applied to Indoor Building Material: Towards an Improved Indoor Air Quality

2011 ◽  
Vol 255-260 ◽  
pp. 2836-2840
Author(s):  
Qing Liang Yu ◽  
M.M. Ballari ◽  
H.J.H. Brouwers
Keyword(s):  
Nitric Oxide ◽  
Indoor Air ◽  
Photocatalytic Oxidation ◽  
Reaction Rate ◽  
Heterogeneous Photocatalysis ◽  
Air Pollutant ◽  
Rate Model ◽  
Proposed Model ◽  
Kinetics Of ◽  
Good Agreement

In the present article, kinetics of the photocatalytic oxidation (PCO) of nitric oxide (NO, as a typical air pollutant) is addressed. An extended Langmuir-Hinshelwood reaction rate model is proposed to describe the PCO of NO under indoor air conditions. The derived model incorporates the influence of the indoor air conditions in the process of the PCO. The good agreement between the predictions from the model and experimental results indicates the validity of the proposed model.

Study on Effects of Nano-Photocatalysis and Non-Thermal Plasma on the Removal of Indoor HCHO

2009 ◽  
Author(s):  
Yuanwei Lu ◽  
Dinghui Wang ◽  
Chongfang Ma
Keyword(s):  
Indoor Air ◽  
Thermal Plasma ◽  
Synergetic Effect ◽  
Experimental Results ◽  
Electrode Configuration ◽  
Air Purification ◽  
Plate Electrode ◽  
Low Level ◽  
Non Thermal Plasma ◽  
Indoor Air Purification

Photocatalysis is an emerging and promising technology for indoor air purification. This photocatalytic oxidation (PCO) method is effective in the case of a higher pollutant concentration, but its wide application in indoor air purification is limited due to the low level of indoor air contaminants. In order to improve the removal of pollutants in indoor air, we have evaluated the photocatalytic performance over the nanosized TiO2 particles immobilized on the surface of an activated carbon (AC) filter for the removal of formaldehyde (HCHO). However the pollutant removal capacity is low at the low level of indoor HCHO over the TiO2/AC film because the predominant influence of residence time during this reaction. In order to improve the photocatalytic removal amount of formaldehyde (HCHO) in indoor air, we studied the combining effect of photocatalysis technology with a non-thermal plasma (NTP) technology on the removal of in door HCHO. Two different plasma electrode configurations, that is wire-to-plate and needle-to-plate electrode configuration, were built and the removal of HCHO was studied by experiment. The experimental results showed that the wire-to-plate electrode configuration is more effective for the HCHO removal than the needle-to-plate electrode configurations. The experimental results using wire-to-plate electrode configuration showed that the removal of HCHO can be enhanced and the removal amount of indoor HCHO can be improved by the combination of PCO and NTP and the combination of PCO and NTP showed the synergetic effect for the indoor HCHO removal. So the combination of PCO and NTP might be a good route for the practical application of photocatalytic technology in indoor air purification.

scholarly journals Photocatalytic Oxidation of PLA/TiO2-Composite Films for Indoor Air Purification

ACS Omega ◽  
2021 ◽  
Vol 6 (16) ◽  
pp. 10629-10636
Author(s):  
Pattamaphon Chanklom ◽  
Torpong Kreetachat ◽  
Rotruedee Chotigawin ◽  
Kowit Suwannahong
Keyword(s):  
Indoor Air ◽  
Photocatalytic Oxidation ◽  
Composite Films ◽  
Air Purification ◽  
Indoor Air Purification

scholarly journals ASSESSMENT OF THE INDOOR AIR PURIFICATION BY PHOTOCATALYTIC PAINTS

2020 ◽  
Vol 50 (2) ◽  
pp. 71-76
Author(s):  
Federico Salvadores ◽  
Orlando Mario Alfano ◽  
María de los Milagros Ballari
Keyword(s):  
Indoor Air ◽  
Photocatalytic Oxidation ◽  
Building Materials ◽  
Photocatalytic Performance ◽  
Construction Materials ◽  
Heterogeneous Photocatalysis ◽  
Air Purification ◽  
Air Flow Rate ◽  
Carbon Doped ◽  
Indoor Conditions

Photocatalytic building materials containing TiO2 were extensively studied for outdoor applications using solar radiation. Nowadays, the market offers a wide variety of these materials with self-cleaning and air purification functionalities. However, heterogeneous photocatalysis applied in indoor construction materials was less developed. The objective of this work is to investigate the photocatalytic performance of carbon doped TiO2 in replacement of the normal pigments in indoor wall paint formulations. To achieve this goal, the photocatalytic oxidation of acetaldehyde in gas phase was carried out. The air decontamination process was conducted using regular indoor light in a bench scale chamber photoreactor simulating a room. The main environmental conditions that affect the photocatalytic process were varied: air flow rate, irradiance, relative humidity and acetaldehyde concentration. The results were analyzed through the response surface methodology and revealed the air purifying power of photocatalytic paints under indoor conditions.

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